Improvement in head-blocks tor saw-mills



Head-Blocks; and I, ALEXANDER W..l.uo.\usON, for

ALEXANDER. W. THOMPSON, OP SAGINAW, MTOHIGANPOR PuMSELP, AND AS -ADMIN- ISTRATOR OP THE ESTATE OP HENRY THOMPSON, DEOEASED.

Letters Patent No. 98,528, dated January/4,1870.

. Ill/.EP'ROVEIVIENl IN HEAD-BLCCKS FOR SAW-MILLS.

The Schedule referred to in these Letters Patent aud making part of che same,

T0 au who?" 'it mail 007mm@ Figure 3 represents a similar bed-plate for tail-block, Be it known thatHiuNnY THOMPSON, deceased, 'resting on the outside carriage F, with a vert-ical late of the oit-y and county of Saginaw, State of Miohbracket, as shown in Figure 4, forming a bearing for igan, and ALEXANDER lV. '.LHOMPSON, the underthe right and left-hand screw, G, and parallel rod, H, Signed ot the city andcounty of Saginaw, State of supporting-dogs ifi, the centre or stationary dogs J, Michigan, invented a new Modeof Holding Logs with- On centre brackets holding the log ir` direct line with saws, when the hand-wheel K'is tur ed, and the dogs a' iy clamped upon the log in any positi n it may occupy, 'as the Screw has a lateral motion inits bearings.

Figure 5 is alsectionof dogs I i.

Figure 6 is a section of plate and carriage.

\Vhat I claim as our invent-ion, and desire to secure by Letters Tatent, is

The combination of the head-block A, with the uprightcylinder B, and in'side cylinder U, containing the round and square dogs l) D, when all the partsare constructed and operate substantially as shown and described.

myself', and as `executor of the last will and testament ot' HENRY THOMPSON, deceased, do declare thatthe following is a full and exact description thereof,-ret` erence being had to the accompanying drawings, and t0 the letters Ot' reference marked thereon.

-'lhenature of the invention consists in holding round and tlat logs for gang-saws, alternately, without. any change of parts or delay.

Figure l is air end view of head-block, and

Eignre 2 is a top or plan view of head-block. v A is the head-block, with upright cylinder B, in which is an inside cylinder, C, containing the round and square dogs 1). This cylinder has only a perpendicular movement; to allow for irregularities of the log.

This head-block is attached tothe inside carriage E.

Z, is a circular 4recess in the bed-plate for the log to rest in.

ALEXANDER- V. THOMPSON.

Witnesses:

G. H. GAGE, E. N. Wlc-Ks. 

